public class Example4_9{
    public static void main(String[] args) {
        SIM simOne=new SIM(13153111111L);
        MobileTelephone mobile=new MobileTelephone();
        mobile.setSIM(simOne);
        System.out.println("手机号码："+mobile.lookNumber());
        SIM simTwo=new SIM(15010722222L);
        mobile.setSIM(simTwo);
        System.out.println("手机号码："+mobile.lookNumber());
    }
}